The mtx binary requires my tape library to be assigned a sg# driver, but
the kernel periodically renumbers the sg devices. Normally, we would
write a udev rule to manually assign a persistent name, but it looks
like things have changed as I can't seem to get a match on CEntOS7. I'd
appreciate any feedback or pointers to help me get my rule working. My
two attempts are below.
cat /etc/udev/rules.d/90-local.rules
KERNEL=="sg[0-9]*", SUBSYSTEM=="scsi_generic", \
ENV{ID_SERIAL}=="1QUANTUM_D0H0112430_LLA", SYMLINK+="sg8"
SUBSYSTEM=="scsi", SUBSYSTEMS=="scsi_genric", \
ATTRS{model}=="Scalar i40-i80 ", SYMLINK:="sg8"
Neither rule above generates a match with udev, so I still have
something wrong. Right now the assignment is sg7 (but it's had other
names in the past.
udevadm info --query=all --name=/dev/sg7
P:
/devices/pci0000:00/0000:00:07.0/0000:04:00.0/0000:05:00.0/0000:06:00.1/host8/rport-8:0-0/target8:0:0/8:0:0:1/scsi_generic/sg7
N: sg7
S: tape/by-id/scsi-1QUANTUM_D0H0112430_LLA
E: DEVLINKS=/dev/tape/by-id/scsi-1QUANTUM_D0H0112430_LLA
E: DEVNAME=/dev/sg7
E:
DEVPATH=/devices/pci0000:00/0000:00:07.0/0000:04:00.0/0000:05:00.0/0000:06:00.1/host8/rport-8:0-0/target8:0:0/8:0:0:1/scsi_generic/sg7
E: ID_MODEL=Scalar_i40-i80
E: ID_MODEL_ENC=Scalar\x20i40-i80\x20\x20
E: ID_REVISION=190G
E: ID_SCSI=1
E: ID_SCSI_SERIAL=QUANTUMD0H0112430_LLA
E: ID_SERIAL=1QUANTUM_D0H0112430_LLA
E: ID_SERIAL_SHORT=QUANTUM_D0H0112430_LLA
E: ID_TYPE=generic
E: ID_VENDOR=QUANTUM
E: ID_VENDOR_ENC=QUANTUM\x20
E: MAJOR=21
E: MINOR=7
E: SUBSYSTEM=scsi_generic
E: USEC_INITIALIZED=28815292891
Assigned and parent device listed below:
udevadm info -a -p `udevadm info -q path -n /dev/sg7`
looking at device
'/devices/pci0000:00/0000:00:07.0/0000:04:00.0/0000:05:00.0/0000:06:00.1/host8/rport-8:0-0/target8:0:0/8:0:0:1/scsi_generic/sg7':
KERNEL=="sg7"
SUBSYSTEM=="scsi_generic"
DRIVER==""
looking at parent device
'/devices/pci0000:00/0000:00:07.0/0000:04:00.0/0000:05:00.0/0000:06:00.1/host8/rport-8:0-0/target8:0:0/8:0:0:1':
KERNELS=="8:0:0:1"
SUBSYSTEMS=="scsi"
DRIVERS=="ch"
ATTRS{rev}=="190G"
ATTRS{type}=="8"
ATTRS{scsi_level}=="4"
ATTRS{model}=="Scalar i40-i80 "
ATTRS{state}=="running"
ATTRS{unpriv_sgio}=="0"
ATTRS{queue_type}=="none"
ATTRS{iodone_cnt}=="0xe2"
ATTRS{iorequest_cnt}=="0xe2"
ATTRS{queue_ramp_up_period}=="120000"
ATTRS{device_busy}=="0"
ATTRS{evt_capacity_change_reported}=="0"
ATTRS{timeout}=="0"
ATTRS{evt_media_change}=="0"
ATTRS{ioerr_cnt}=="0x7"
ATTRS{queue_depth}=="30"
ATTRS{vendor}=="QUANTUM "
ATTRS{evt_soft_threshold_reached}=="0"
ATTRS{device_blocked}=="0"
ATTRS{evt_mode_parameter_change_reported}=="0"
ATTRS{evt_lun_change_reported}=="0"
ATTRS{evt_inquiry_change_reported}=="0"
ATTRS{dh_state}=="detached"
ATTRS{iocounterbits}=="32"
ATTRS{eh_timeout}=="10"
Would anyone mind pointing out the error in my udev rule or proposing a
better way of getting a persistent sg device name?
--
Thanks in advance,
John H. Nyhuis
Desk: (206)-685-8334
jnyhuis at uw.edu
Box 359461, 15th floor, 106